Hot-air furnace.



N0. 657.0l6. Patented Aug. 28, I900. G. THOMSON.

HOT AIR FURNACE.

(Application filed Sept. 25, 1899.) (No Model.)

4 SheetsSheet I.

60298 J'Zwvaron,

No, 657,0I6. Patented Aug. 28, l900..

G. THOMSON.

HOT AIR FURNACE.

(Apflication filed se 25, 1899.)

(No Model.) 4 SheetsSheet 2.

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i fizz/622% 9 Zomaon,

N0. 657,0l6. I Patented Aug. 28, I900. G. THOMSON.

HOT AIR FURNACE.

(Application filed Sept. 25, 1899.) (No Model.) 4 Sheets-Sheet 3.

629023919 fiomaon,

No. 657,016. Patented Aug. '28, I900.- G. THOMSON.

HOT AIR FURNACE.

(Application filed Sept. 25, 1 s99.

(No Model.) 4 Sheets-Sheet 4.

five/52%;",

Gauge Zomaore,

STATES PATENT OFFIcn.

GEORGE THOMSON, OF CHICAGO, ILLINOIS.

HOT-AIR FURNACE.

SPECIFICATION forming part of Letters Patent No. 657,016, dated August 28, 1900.

Application filed September 25, 1899. Serial No. 731,615 No model.

To all whom it may concern:

Be it known that I, GEORGE THOMSON, a citizen'bf the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Hot-Air Furnaces, of which the following is a specification.

My invention relates to an improvement in the class of furnaces for heating air in which the regenerative principle is employed of passing the air to be heated and the products of combustion for heating it in relatively-contrary directions for the purpose of primarily subjecting the cool air to the products of combustion in their spent or least-hot condition and progressively to the increasing gradations of heat in the products of combustion in the course thereof to their discharge-outlet,thereby the more thoroughly to exhaust them of their heat-units and accordingly transfer the same to the air.

My object is to provide a novel construction of furnace of the class referred to where- ,by this principle shall be employed to the best economical advantage.

Referring to the accompanying drawings, Figure 1 is a vertical sectional view of a hotair furnace containing my improvements, the section being taken at the line 1 on Fig. 2 and regarded as indicated by the arrow. Figs. 2 3, 4, and 5 are transverse sections of the same, taken, respectively, at the lines 2, 3, 4, and 5 on Fig. 1 and viewed in the direction of the arrows, but showing the burner in Fig. 5 in plan elevation. Fig. 6 is a developed diagrammatic sectional view taken at the line 6 6 on Fig. A and regarded as indicated by the arrows and Fig. 7, a broken section taken at the line 7 on Fig. 2 and viewed in the direction of the arrow.

A is the outer sheet-metal shell or casing, shown rising from a suitable base B and with a covered cone frustum-shaped or upwardlytapering dome C, provided with the circumferential series of flanged openings (1 a, from which to extend the hot-air-conducting pipes (not shown) to the different apartments to be heated. Another sheet-metal casing D within and concentric with the outer shell forms therewith an air-heating chamber E and with a similar inner shell F the circulating-chamber G for the hot products of combustion,hav-

ing at its base a discharge-duct 19, leading through the outer shell. A disk-shaped annular shell forming a chamber H for the proclucts of combustion, the central opening I) in which tapers upwardly, surmounts'the shells D and F and is flanged about its upper edge, as shown at c, to extend it to the inner wall of the casing A, about which it is supported at the flange on a ledge d. On the chamber H is supported in elevated position over its central opening a disk-shaped baffle-plate c, which laps at its edge an annular baffle-plate f, extending about the inner wall of the cas ing A, near the base of the top 0. In the central air-heating furnace-chamber I,formed by the shell F, rises the combustion-chamber K, of general cone shape, having a fine connection g with the chamber H through its inner slanting wall at b. A vertical section of each of the shells D F, extending throughout their entire length, is cut out, and the chamber G is closed at its opposite ends, thus formed by vertical walls '5 1', Figs. 4 and 5, between which extends near the base of the furnace and through an opening in the outer casing A a door-closed chamber L, leading into the base portion of the conical chamber K. A diaphragm M extends spirally within the chamber I from near its upper end at the wall i, across the space between the walls a" a, downward about the exterior ofthe chamber K and terminates with its lower end at the back of the chamber 1, and underneath the outer end of the spiral diaphragm the space in the chamber I between the wall 2" and conical chamber K is closed by a vertical partition is. The space between the shells A and D is closed at the side of the fire-box L, adjacent to the wall 2', by a vertical partition is, extending from the base of the furnace to the upper ends of the shells.

While the nature of the fuel for use with myimproved furnace structure is immaterial, I show a burner N in the base of the chamber K suitable for burning gas, with a supplypipe Z leading thereto in the box L. The hot products of combustion generated in the conical chamber K discharge from its upper narrower end through the flue 9 into the chamber H, at one side of a partition m therein, shown extending across it in general Z shape,

and they course around that chamber, in-- tensely heating its walls, to the outlet 0 therein at the opposite side of the partition. From the outlet 0 the hot gases enter the chamber G through a duct 0, Fig. 7, shown depending fills that chamber and circulates about it in;

contact with the shell D, from which it takes up heat transmitted to the shell by the partlyspent gases coursing in the contrary direction through the chamber G. When the air thus initially heated by the gases in the preliminary-heating chamber G reaches that part of the chamber E adjacent to the end wall 11 of the chamber G, it passes between the vertical partitions is and it into the inner airchamber I, underneath the spiral diaphragm M, and about the intensely-hot conical chamber K till it passes the lower inner end of the diaphragm whence it rises in a very hot condition in the chamber I above the spiral diaphragm into contact with the intensely-hot} disk-shaped chamber H and through the 'central opening 12 therein into the dome 'or top i G, being more or less retarded in its rise to? hold it the longer under subjection to heat in the chamber I and the better to distribute 1 it in the dome to the pipes at a by the baffies e f. The combustion-chamber should be fed with heated rather than cold air. Accordingly I provide a duct 19 for introducing air from the chamber I to the chamber L. The

shape of the combustion-chamber K,- where by it is restricted toward its upper end, is

center from below, with the advantage of a tendency to induce uniform distribution of the hot air to the pipes at a.

What I claim as new, and desire tose'cure by Letters Patent, is-

1. In a hot-air furnace, the combination of .an outer casing, shells therein forming a preliminary-heating chamber and an inner airchamber and forming with said casing an outer air-chamber through which and said preliminary-heating chamber course, respectively, the air to be heated and the products of combustion for heating it, said inner airchamber communicating with said outer airchamber through an opening in said prelimi-,

nary-heating chamber, a shell in said inner air-chamber forming a combustion-chamber, an annular shell forming a heating-chamber surmounting said chambers and communicating with said combustion and preliminaryheating chambers, and a dome covering said annular shell and forming a hot-ai r chamber above it having communication with said in- '1 nor air-chamber only through the opening in said annular shell, substantially as described.

2. In a hot-air furnace, the combination of an outer casing, shells therein forming a preliminary-heating chamber and an inner airchamber and forming with said casing an outer air-chamber through which and said preliminary-heatin g chamber course, respec tively, the air to be heated and the products of combustion for heating it, said inner airchamber communicating with said outer airchamber through an opening in said preliminary-heating chamber, a shell in said inner air-chamber forming a combustion-chamber,

an annular shell forming a heating-chamber surmounting said chambers and containing a transverse partition from opposite sides of which it communicates, respectively, with said combustion-chamber and said preliminary-heating chamber, and a dome covering said annular shell, substantially as described.

3. In a hot-air furnace, the combination of an outer casing, shells therein forming a preliminary-heating chamber and an inner airchamb'er and forming with said casing an outer air-chamber through which and said preliminary-heating chamber course, respectively, the air to be heated and the products of combustion for heating it, said inner airchamber communicating with said outer airchamber through an opening in said preli1ni-. nary-heating chamber, a shell in said inner air-chamber forming a combustion-chamber, a diaphragm disposed about said combu stionchamber in said inner air-chamber and extending from one side of said opening, an annular shell forming a heating-chamber surmounting said chambers and communicating withsaid combustion and preliminary-heating chambers, and a dome covering said annular shell, substantially as described.

4. In a hot-air furnace, the combination of an outer casing, shells therein forming a preliminary-heatingchamber and an inner airchamber and forming with said casing an outer air-chamber through which and said preliminary-heating chamber course, respectively, the air to be heated and the products of combustion for h'eating it, said inner airchamber communicating with said outer airchamber through an opening in said preliminary-heating chamber, a conical shell in said:

its smaller end and with said preliminaryheating chamber, and a dome covering said annular shell, substantially as described.

5. In a hot-air furnace, the combination of an outer casing, shells therein forming a preliminaryheating chamber and an inner air chamber and forming with said casing an outer air-chamber through which and said preliminary-heating chamber course, respectively, the air to be heated and the products of combustion for heating it in relatively-contrary directions, said heating-chamber having an opening extending through it and being closed by end Walls at said opening, through which said inner and outer air-chambers communicate, a partition extending at one side of said opening across said outer air-chamber, a shell in said inner air-chamber forming a combustion-chamber, a partition extending from the opposite side of said opening to said combustion-chamber, a diaphragm extending from said opening about the shell in said inner air-chamber, an annular shell forming a heating-chamber surmounting said chambers and communicating with said combustion and them suceessively,a dome covering said cham-v bers, and an annular shell forming a heatingchamber surmounting said chambers, with its opening over the inner air-chamber, said annular chamber discharging into said preliminary-heating chamber, substantially as described.

' GEORGE THOMSON. In presence of- R. T. SPENCER, D. W. LEE. 

